JPS63147616A - Injection molding of plastic - Google Patents
Injection molding of plasticInfo
- Publication number
- JPS63147616A JPS63147616A JP24697486A JP24697486A JPS63147616A JP S63147616 A JPS63147616 A JP S63147616A JP 24697486 A JP24697486 A JP 24697486A JP 24697486 A JP24697486 A JP 24697486A JP S63147616 A JPS63147616 A JP S63147616A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- flange
- resin
- recess
- injection molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004033 plastic Substances 0.000 title claims description 3
- 238000001746 injection moulding Methods 0.000 title claims 4
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 239000011347 resin Substances 0.000 claims abstract description 17
- 239000011800 void material Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1459—Coating annular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C45/14221—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure by tools, e.g. cutting means
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はベアリング等と一体に樹脂で封止成形されたア
クチュエータ等のプラスチック射出成形物の製造方法に
関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a plastic injection molded product such as an actuator that is integrally molded with a bearing or the like using a resin.
（従来技術）
従来より樹脂で成形された本体部分と、該本体部分に一
端が埋没し他端が突出したベアリングを有するアクチュ
エータが知られている。この様なアクチュエータを成形
するには、第２図の様てガイド８を有する下型２の凹部
５に中空のベアリング４を挿入し、上型１の上壁面７と
凹部５の底面９との間でベアリング４を固定しながら、
本体部分を形成させる為の空所３内に樹脂を射出する。(Prior Art) Actuators are known that have a main body portion molded from resin and a bearing that has one end buried in the main body portion and a bearing that protrudes from the other end. To mold such an actuator, the hollow bearing 4 is inserted into the recess 5 of the lower mold 2 having the guide 8 as shown in FIG. While fixing the bearing 4 between
Resin is injected into the cavity 3 for forming the main body part.
この場合、上記ベアリング４の端面と上型及び下型との
間に樹脂が入り込まない様にする為、上記ベアリング４
の全゛長は、上記上型１の上壁面７と凹部５の底面９と
の間隔に一致させる。In this case, in order to prevent resin from entering between the end face of the bearing 4 and the upper and lower molds, the bearing 4 is
The total length of is made to match the distance between the upper wall surface 7 of the upper mold 1 and the bottom surface 9 of the recess 5.
（発明が解決しようとする問題点）
しかしながら、上述の様なアクチュエータを量産してい
る間に、下型２の凹部５とベアリング４とのすき間６に
樹脂が入り込んで、ベアリング４の表面に付着する。又
、凹部５の内面にも付着して、以後ベアリングが挿入出
来なくなる。さらに、ベアリング４の寸法が、少しでも
長くなると、型締めしたさいてベアリング４が座屈して
変形する欠点があった。(Problem to be Solved by the Invention) However, during the mass production of actuators as described above, resin enters the gap 6 between the recess 5 of the lower mold 2 and the bearing 4 and adheres to the surface of the bearing 4. do. It also adheres to the inner surface of the recess 5, making it impossible to insert the bearing from now on. Furthermore, if the dimensions of the bearing 4 were even slightly longer, there was a drawback that the bearing 4 would buckle and become deformed when the mold was clamped.
（問題点を解決する為の手段）
本発明は、この様な問題点を解決する為、あらかじめベ
アリングに鍔部を設け、上記すき間を塞ぐ様にしたもの
である。(Means for Solving the Problems) In order to solve these problems, the present invention provides a flange portion on the bearing in advance to close the above-mentioned gap.
（作用）
この様にすき間が塞がれているので樹脂がすき間に入り
込むことがない。従って、ベアリングの寸法も短かく出
来るので、上述の様な座屈も防止出来る。(Function) Since the gap is closed in this way, the resin will not get into the gap. Therefore, the dimensions of the bearing can be shortened, and buckling as described above can be prevented.
（実施例）
第１図は本発明の一実施例である。図において第２図と
同様の部分には同一符号を付してその説明を省略するも
、第２図と異なる部分はベアリング４に変形可能な鍔部
１０を設け、該鍔部１０の露出面１１と上記ベアリング
４の上端面１２との間４−１の長さを、上記空所３の厚
さ１３より長くした点である。こうして型締めすると上
記鍔部１０は下型２により押し上げられて変形後退し、
上記すき間６を完全に塞、ぐ。従って鍔部１０の外径は
すき間６を塞ぐ為凹部５の内径より充分大きくする。こ
の様にすればすき間６に樹脂が入９込むことがないので
、量産が容易である。又、ベアリング４の突出部４−２
の長さを凹部５の深さより短かく出来るので、型締めの
さいベアリングが座屈することもない。又、光ピツクア
ップ用のアクチュエータは特に精度を高める必要があシ
、この様な場合ＢＭＯ樹脂（不飽和ポリエステル樹脂）
°が用いられるが、ＢＭＣ樹脂は非常にすき間ＫＡＪ込
み易いので、本発明は効果的である。(Example) FIG. 1 shows an example of the present invention. In the figure, the same parts as in FIG. 2 are given the same reference numerals and their explanations are omitted, but the parts that are different from FIG. 11 and the upper end surface 12 of the bearing 4 4-1 is made longer than the thickness 13 of the space 3. When the mold is clamped in this way, the flange 10 is pushed up by the lower mold 2 and deformed and retreated,
Completely close the gap 6 above. Therefore, the outer diameter of the flange 10 is made sufficiently larger than the inner diameter of the recess 5 in order to close the gap 6. In this way, the resin will not enter the gap 6, making mass production easy. Also, the protrusion 4-2 of the bearing 4
Since the length can be made shorter than the depth of the recess 5, the bearing will not buckle during mold clamping. In addition, the actuator for optical pickup requires particularly high precision, and in such cases BMO resin (unsaturated polyester resin) is used.
Although KAJ is used, the present invention is effective because BMC resin is very easy to get into the gap.
なお鍔部ＩＱは樹脂をアウトサートしても良く、彼我め
しても良い。In addition, the tsuba IQ may be made of resin or may be made of resin.
（効果）
以上の様に本発明によれば、樹脂で形成された本体にベ
アリングを１体成形したアクチュエータのベアリング部
表面に余分の樹脂が付着せず、又、型にも余分な樹脂が
付着しないので量産が容易であるへ
は唖足クイｆｉｌを示す断面図である。(Effects) As described above, according to the present invention, excess resin does not adhere to the bearing surface of the actuator in which the bearing is integrally molded into the main body made of resin, and excess resin does not adhere to the mold. This is a cross-sectional view showing a retractable screw filtration device, which is easy to mass-produce because it does not have a large diameter.
■・・・上型 ２・・・下型
、１・・・ベアリング ８・・・鍔部特許出願人
日本コロムビア株式会社−″パソ
？、−： Ｉ ＴＴＩ■... Upper mold 2... Lower mold, 1... Bearing 8... Flange patent applicant
Nippon Columbia Co., Ltd.-”Paso?,-: I TTI
Claims (1)
出成形型と、上記両型の上記空所を形成する内面のうち
の一面内に設けられた凹部と、中間部に上記凹部の開口
より大なる外形を有する機械的強度の低い鍔部を設けた
棒状体であつて、上記鍔部を含む部分の長さを上記空所
を形成する上記一面と該一面に対向する面との間隔より
長くした棒状体とを有し、該棒状体の上記鍔部を含まな
い部分を上記凹部内に挿入し、上記第１及び第２の型を
型締めして上記空所を形成すると共に上記鍔部を変形後
退させて上記凹部を塞ぎ、上記空所内に樹脂を射出する
ことを特徴とするプラスチックの射出成形方法。first and second injection molding molds forming a cavity for injection molding the main body, a recess provided in one of the inner surfaces of the two molds forming the cavity, and the recess in an intermediate portion. is a rod-shaped body provided with a flange having a low mechanical strength and having an outer diameter larger than the opening, the length of the portion including the flange being equal to the one surface forming the void and the surface opposite to the one surface. a rod-shaped body having a length longer than the distance between the two, a portion of the rod-shaped body not including the flange is inserted into the recess, and the first and second molds are clamped to form the cavity. A plastic injection molding method characterized in that the flange is deformed and retreated at the same time to close the recess, and resin is injected into the cavity.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61-111960 | 1986-07-21 | ||
| JP11196086 | 1986-07-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63147616A true JPS63147616A (en) | 1988-06-20 |
| JPH0413132B2 JPH0413132B2 (en) | 1992-03-06 |
Family
ID=14574460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24697486A Granted JPS63147616A (en) | 1986-07-21 | 1986-10-17 | Injection molding of plastic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63147616A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57163526A (en) * | 1981-04-01 | 1982-10-07 | Sumitomo Bakelite Co Ltd | Preparation of molded product including insert |
-
1986
- 1986-10-17 JP JP24697486A patent/JPS63147616A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57163526A (en) * | 1981-04-01 | 1982-10-07 | Sumitomo Bakelite Co Ltd | Preparation of molded product including insert |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0413132B2 (en) | 1992-03-06 |
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